Question to the Department for Transport:

To ask His Majesty's Government what assessment they have made of the potential impact of permitting crop-based biofuels to be eligible under the Sustainable Aviation Fuel Mandate on investment in (1) waste-based biofuels, and (2) e-fuels.

On 22 December 2025 the Department for Transport published a call for evidence to gather views and update our evidence base on crop-derived sustainable aviation fuel (SAF).

The call for evidence will improve our understanding of the impacts and interactions of deploying crop feedstocks in SAF on feedstock availability, industrial development, and on sustainability. This will include considering the impact on food prices, biodiversity, and investment in waste-based biofuels and e-fuels.

This reflects our commitment to ensure our policies are informed by the best and most recent evidence. The call for evidence does not propose any changes to the SAF Mandate. In the light of the responses to the call for evidence, should there be a case to review the feedstock eligibility criteria, it would be subject to consultation before any legislative change.